[LLVMdev] How to get a pointer to a constant struct?

[Callum Rogers]

Hi,

I'm trying to create a constant (named) struct and store a pointer to it 
in another struct using the C Api (and the llvm-fs bindings). As a 
contrived example, this is what I want to do:

%A = type { %VTable* }
%VTable = type { void (%A*)*, void (%A*)* }

define void @main(%A* %a) {
entry:
   %0 = getelementptr inbounds %A* %a, i32 0, i32 0 ; [type=%VTable**]
   %2 = somehow make a pointer to: { void(%A*)* null, void (%A*)* @main }
   store %VTable* %2, %VTable** %1
   ret void
}

How would I do the "somehow make a pointer to" part? I currently make 
the constant named struct by using LLVMConstNamedStruct(passing in 
%VTable, [null, @main]) and have tried using LLVMConstGEP with [0] as 
the indices on this but both times I get an assertion error saying:

"Assertion failed: getOperand(0)->getType() == 
cast<PointerType>(getOperand(1)->getType())->getElementType() && "Ptr 
must be a pointer to Val type!", file I
nstructions.cpp, line 1056"

Cheers,
Callum Rogers

(I am using LLVM 3.1 btw)